The magnetic exchange interaction via N-H⋯O-bonding in copper(II) complex with 1-phenyl-3-methyl-4-formylpyrazol-5-one 2-quinolylhydrazone

Intermolecular exchange coupling (2J = −3.25 cm−1) between copper(II) centers through unusually long superexchange pathway Cu-N-N⋯H-O-C-O-Cu is studied experimentally (XRD, ESR and magnetic susceptibility measurements) and DFT modeling.